Boiler



1951 5.1L: CLAIRE ETAL I 2,565,973

BOILER 7 Filed March 21, 1946 2 Sheets-Sheet 1 Aug. 28, 1951 E. J. L EICLAIRE ET AL I 2,555,973

' Q BOILER Filed March 21, 1946 2 Sheets-Sheet 2 lay/1w! ladtw'wPatented Aug. 28, 1951 'Eugene 'J. Le Claire and Bernard 1.";Heininnan,St. Paul,' -Minn.,-: assignorsztoi-HarryaF. :Joesting,

- St. PauL Minn.

' Application March-21, 1946;SerialNo:655,928

72 Claims. (Cl. 122-166) Our invention relates :toanimprovement tin.boilers of a type usedfor developingr-steam-pres- 'sure or the like.

Countless typeslof boilers have been developed for, converting waterto-steam and for similar purposes. .Some of "these boilers includehorizontal :boiler tubes and others have included vertical fiues. It isan objectofthe presentinvention to .=produce a boiler which isextremelyefiicient in operation and which utilizes a. large proportionof 'theheat supplied for .convertingwatento steam.

.A feature of. the present.inventionxresides. in

:theiact that the boiler may beaoonstructed .with aminimum ofdifiiculty. Where heat flues'of one -.type or anothersare employed inheat exchange relation with adjacentcompartments containing .-water;extreme caremustzbetaken :to insure. .the

water tightness of the .boiler sothatfitwillastand the necessary.temperatures and pressures.

.It is an object of .thepresent invention to pro uvide an apparatuscontaining-heat flues which may be .easily welded together aatitsassembly :.operation.

A feature of :the present; inventionpresides- .in :theprovision of aboiler made from lengths "of i heavy tubing which 'may be readilypurchased,

readily handled and easily assembled. .:By designing the boiler ofmaterialwhichiissreadilypavail- :able: the cost of manufacturing-theboileris'considerably reduced.

A feature of the present invention resides in the provision of a boilerincluding an inner and outer shell between 'whichwater may be contained.Heat from a suitable source of supply is applied beneath the shells andthe. innermost shell is open at its lower extremity so that heat maypass into the inner shell to heat the water between the two shells. Atopclosure or partition is provided for the inner shell and a topclosure ':is also provided for the outerishell whichissubgstantiallyspaced from the top-ofthe inner tubu- .-lar member.

A draft flue extends through the partition forming the top closure of:the inner shell and extends through the outer shell above the partition.

Afeatureof the present invention is'torprovide :a series of angularlyspaced tubular members which extend through the partition member" or topclosure of the innershelland are closed at.

their lower extremity. The lower end of each of these spaced tubularmembers is connected by .a

suitable spacing nipple-to the-inner shellin such a way as to allowwater to fiow from the bottom of the space between the shells into thelower end of each of the angularly spaced tubular members.

"Thus'I provide a: series.

of columns of water in the path of the heated air passing upwardlyintothe boiler toward the escape flue.

A further feature of the'present invention' lies in the provision of acentral tubular chamber coaxial withthe outerand inner shells andsuphorted from the inner shell by tubes ornipples. Ihis centr alfiueorchamberis closed at: its :top

'-- and "bottom ends; but water may circulate therethroughby means ofthe supportingnipples.

A further feature of the presentiinvention res'i'des in providing acentral-chamber crime of somewhat-larger diameter than'the escape flueextending through the partition or top' closure of the inner shellandin'placingthe central flue im- 'me'diately below the entrance to theescape flue.

Asa result the heated air travelling through the boiler must travel in atortuous path in orderto leave the boiler by wayof the escape flue.

An added feature of' the present inventionli'es -in providing a-steamoutlet -'in'tthe 'form ofa T connection extending through the outershell above the topof the-inner shell. This T con- 'nectionprovides apair of opposed steam inlets which-equalize one another and whichproduce a smooth-and even-flow of steam through the outlet. These andother 'objects'and novel features of "our invention will be more clearlyand fully set forth-in the following specification and claims.

In the drawings forming apart of our speci- 'Figurel is'a verticalsectional view through the-boiler showing the construction thereof.

Figure Z'is a transvers'esectional view through -the"boiler, theposition of the section being indi- "cated by the line-2+2 ofiFigure-l.

'fjFigureBisa transverse section through a portion of our boiler, theposition 'of this section being indicated'by theline'3--3 ofFigure 1.

The boiler A includes an outer shell lllhaving 1 anopen lower end H anda top closure l2. The top ring-shaped chamber M. Y A partition or-to-pclosure [6 is welded orotherclosure is preferably domed in order "tobetter withstand pressure. The top Z is securely welded to the 'top'o'fthe outer shell' l'o as indicated.

' An inner shell i 3-concentric with the outer shell II) is spacedtherefrom to-p'rov'ide a ring-shaped water compartment '14 between thetwo shells. A ring I5 is welded between the outer and inner shells It]and E3 to close thelower extremity ofthe wise afiixed to the upper endof the inner-shell I3. A central aperture I 1 is provided in thepartition IE toaccommodate the vertical tubular 3 portion I9 of the heatescape flue. As illustrated in Figure 1 the escape flue is angularlyshaped being provided with a transversely extending flue portion 20connected to the vertical tubular portion l9. The tube 20 extendsthrough an aperture 2| in the outer shell 10 at a point substantiallyabove the partition 16. In the partition I6 is provided'a seriesofangularly spaced apertures 22 through which the upper ends of a seriesof angularly spaced tubes 23 extend. These tubes are securely welded orotherwise ailixed to the partition l6 so as to provide a water tightjoint therewith. The lower end of each of the tubes 23 is provided witha closure 24. A nipple 25 connects the lower end of each tube 23 to theinner shell 13. Each nipple 25 extends through the inner shell l3 andthrough the wall of the tube 23 so as to form a connecting passagetherebetween. I

A central tubular chamber 25 is arranged coaxially with the shells Illand I3 and within the angularly spaced series of tubes 23. The tubularchamber 26 is provided with a top closure 21 and I a bottom closure 29and is connected to the inner shell 13 by means of an upper nipple 30and a lower nipple 3|. These nipples extend through the wall of thetubular chamber 26 and through the wall of the inner shell I 3 forming aconnecting passage between the interior of the chamber 26 and thechamber 14 between the concentric walls 10 and [3.

An inlet connection 32 is provided in alignment with the nipple 31 atthe lower extremity of the ring-shaped chamber l4; A steam outletpassage 33 is provided in'the outer shell l just below the top closure12 thereof. A nipple 34 extends inwardly from the outlet 33 and providesa support for a T connection '35 having a pair of opposed inlets 36 and31. This double inlet provides an equalized passage into which the steammay flow, providing a smooth and constant flow of steam from the boiler.

An inspection door 39 closes the inspection door opening 40 in the usualmanner. A bridge 4| on the exterior of the boiler bridges the opening 40and a bolt 42 extends through the door 39 and the bridge 4! to clamp theinspection door in sealed position. When steam pressure is built upwithin the boiler, this pressure tends to more tightly urge the door 39against the outer surface of the boiler wall.

The operation of the apparatus is believed obvious from the foregoingdescription. Heat is applied from beneath the boiler in the usualmanner, the boiler illustrated being usually used in conjunction with agas burner or oil burning device of some type. The heat enters the spacedefined by the outer shell and is guided by the ring to within the innershell [3. Within the inner shell the'heat may rise about the angularlyspaced tubes 23 and about the central tubular chamber 26, these tubesbeing heated by contact with the heated air. The tubes preferablycontain water which is transformed into steam due to the heat applied.The heat strikes the partition or tube 16 and must move laterally toescape through the escape flue 19. A sufficient draft is formed to movethe heated air in this manner.

Throughout the entire period of time when the heated air is within theboiler, it is constantly in contact with some heat exchange member totransmit heat thereto. The elbow bent in the desire to have itunderstood that obvious changes may be made within the scope of thefollowing claims without departing from the spirit of our invention.

We claim:

1. A boiler comprising spaced inner and outer shells having closed upperends and open lower ends, a ring-shaped partition between said shells toclose the chamber formed between said shells,

a series of circumferentially spaced water tubes open at their upperextremities and extending through the closed upper end of said innershell, closed lower ends on' said water tubes, an individual connectingpassage between the lower ends of each of said water tubes and saidchamber, a central water tube having flat end plates closing both ends,lateral connecting passage means adjacent each end plate and connectingthe upper and lower ends of said central water tube and said chamber,and an escape flue extending through the upper end of said inner shell,through said chamber, and laterally through said outer shell.

2. A boiler comprising spaced inner and outer shells having closed upperends and open lower ends, a ring-shaped partition between said shells toclose the chamber formed between said shells, a series ofcircumferentially spaced water tubes open at their upper extremities andextending through'the closed upper end of said inner shell, closed lowerends on said water tubes, an individual connecting passage between thelower ends of each of said water tubes and said chamber, a central watertube having flat end plates closing both ends, lateral connectingpassage means adjacent each end plate and connecting the upper and lowerends of said central water tube and said chamber, and an escape flueextending through the upper end of said inner shell and laterallythrough said outer shell, said escape flue beginning directly above theclosed upper end of said central water tube and spaced therefrom.

EUGENE J. LE CLAIRE. BERNARD J. HEINZMAN.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 257,217 Gorton May 2, 1882316,274 Latimer Apr. 21, 1885 401,556 Hallett Apr. 16, 1889 421,194 RossFeb. 11, 1890 548,934 Vanness et al Oct. 29, 1895 737,250 La France Aug.25, 1903 742,847 Dugan Nov. 3, 1903 1,901,730 Brooks Mar. 14, 19331,949,939 Simmons Mar. 6, 1934' 2,061,087 Power Nov. 17, 1936 FOREIGNPATENTS Number Country Date 253,026 Italy Apr. 30, 1927

